Publication Laka-library:
X-ray machine. Irridiation facilities of Euratom -ITAL (1963)
| Author | ITAL, Euratom |
| Date | May 1963 |
| Classification | 1.01.8.60/10 (ITAL WAGENINGEN - GENERAL) |
| Front | 
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From the publication:
X- RAY MACHINE The X-ray machine occupies a special position among all the irradiation facilities available to the research worker, the reason being that it is comparatively inexpensive, easy to handle, only irradiates when in operation and generally speaking has an attractive output and field size, so that acute radiation of seeds, small plants and animals is readily applied. Since the dosimetry can also be regulated very accurately it is understandable that an apparatus of this type is very frequently used for radiobiological research in general and mutation breeding in particular. TECHNICAL DETAILS. The X-ray machine is a Philips 250/25 deep-therapy apparatus with a stabilized high tension adjustable from 50 to 250 kilovolt (kV) and a stabilized tube current adjustable from 5 to 25 milliampere (mA). The tube (with cooling, shielding, lead shutter, etc) can be moved vertically along a stand and can also be rotated in any direction, as a result of which the beam can be pointed up, down or horizontally (photograph 1). The dose rate depends on the voltage (kV), the amperage (mA), the focus distance employed (i.e. the distance between the focus in the tube and the irradiated object) (see graph on page 1 0) and the presence or absence of a filter between the focus and the object. The dose is the product of dose rate and irradiation time. The hardness of the radiation depends on the voltage used (kV); with a higher voltage the continuous spectrum moves in the direction of harder radiation.
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